Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/debugfs.h> | |
4c11d7ae | 18 | #include <linux/pagemap.h> |
bc0c38d1 SR |
19 | #include <linux/hardirq.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/ftrace.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/init.h> | |
2a2cc8f7 | 27 | #include <linux/poll.h> |
bc0c38d1 SR |
28 | #include <linux/gfp.h> |
29 | #include <linux/fs.h> | |
30 | ||
31 | #include "trace.h" | |
32 | ||
33 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; | |
34 | unsigned long __read_mostly tracing_thresh; | |
35 | ||
60a11774 SR |
36 | static int tracing_disabled = 1; |
37 | ||
bc0c38d1 SR |
38 | static long notrace |
39 | ns2usecs(cycle_t nsec) | |
40 | { | |
41 | nsec += 500; | |
42 | do_div(nsec, 1000); | |
43 | return nsec; | |
44 | } | |
45 | ||
750ed1a4 IM |
46 | notrace cycle_t ftrace_now(int cpu) |
47 | { | |
0fd9e0da | 48 | return cpu_clock(cpu); |
750ed1a4 IM |
49 | } |
50 | ||
bc0c38d1 SR |
51 | static struct trace_array global_trace; |
52 | ||
53 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
54 | ||
55 | static struct trace_array max_tr; | |
56 | ||
57 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
58 | ||
26994ead | 59 | static int tracer_enabled = 1; |
4c11d7ae | 60 | static unsigned long trace_nr_entries = 16384UL; |
bc0c38d1 SR |
61 | |
62 | static struct tracer *trace_types __read_mostly; | |
63 | static struct tracer *current_trace __read_mostly; | |
64 | static int max_tracer_type_len; | |
65 | ||
66 | static DEFINE_MUTEX(trace_types_lock); | |
2a2cc8f7 | 67 | static DECLARE_WAIT_QUEUE_HEAD (trace_wait); |
bc0c38d1 | 68 | |
4c11d7ae SR |
69 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
70 | ||
bc0c38d1 SR |
71 | static int __init set_nr_entries(char *str) |
72 | { | |
73 | if (!str) | |
74 | return 0; | |
75 | trace_nr_entries = simple_strtoul(str, &str, 0); | |
76 | return 1; | |
77 | } | |
78 | __setup("trace_entries=", set_nr_entries); | |
79 | ||
57f50be1 SR |
80 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
81 | { | |
82 | return nsecs / 1000; | |
83 | } | |
84 | ||
bc0c38d1 SR |
85 | enum trace_type { |
86 | __TRACE_FIRST_TYPE = 0, | |
87 | ||
88 | TRACE_FN, | |
89 | TRACE_CTX, | |
f0a920d5 | 90 | TRACE_SPECIAL, |
bc0c38d1 SR |
91 | |
92 | __TRACE_LAST_TYPE | |
93 | }; | |
94 | ||
95 | enum trace_flag_type { | |
96 | TRACE_FLAG_IRQS_OFF = 0x01, | |
97 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
98 | TRACE_FLAG_HARDIRQ = 0x04, | |
99 | TRACE_FLAG_SOFTIRQ = 0x08, | |
100 | }; | |
101 | ||
102 | enum trace_iterator_flags { | |
103 | TRACE_ITER_PRINT_PARENT = 0x01, | |
104 | TRACE_ITER_SYM_OFFSET = 0x02, | |
105 | TRACE_ITER_SYM_ADDR = 0x04, | |
106 | TRACE_ITER_VERBOSE = 0x08, | |
f9896bf3 | 107 | TRACE_ITER_RAW = 0x10, |
5e3ca0ec IM |
108 | TRACE_ITER_HEX = 0x20, |
109 | TRACE_ITER_BIN = 0x40, | |
2a2cc8f7 | 110 | TRACE_ITER_BLOCK = 0x80, |
bc0c38d1 SR |
111 | }; |
112 | ||
113 | #define TRACE_ITER_SYM_MASK \ | |
114 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
115 | ||
116 | /* These must match the bit postions above */ | |
117 | static const char *trace_options[] = { | |
118 | "print-parent", | |
119 | "sym-offset", | |
120 | "sym-addr", | |
121 | "verbose", | |
f9896bf3 | 122 | "raw", |
5e3ca0ec | 123 | "hex", |
cb0f12aa | 124 | "bin", |
2a2cc8f7 | 125 | "block", |
bc0c38d1 SR |
126 | NULL |
127 | }; | |
128 | ||
129 | static unsigned trace_flags; | |
130 | ||
4c11d7ae | 131 | static DEFINE_SPINLOCK(ftrace_max_lock); |
bc0c38d1 SR |
132 | |
133 | /* | |
134 | * Copy the new maximum trace into the separate maximum-trace | |
135 | * structure. (this way the maximum trace is permanently saved, | |
136 | * for later retrieval via /debugfs/tracing/latency_trace) | |
137 | */ | |
4e3c3333 | 138 | static notrace void |
bc0c38d1 SR |
139 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
140 | { | |
141 | struct trace_array_cpu *data = tr->data[cpu]; | |
142 | ||
143 | max_tr.cpu = cpu; | |
144 | max_tr.time_start = data->preempt_timestamp; | |
145 | ||
146 | data = max_tr.data[cpu]; | |
147 | data->saved_latency = tracing_max_latency; | |
148 | ||
149 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
150 | data->pid = tsk->pid; | |
151 | data->uid = tsk->uid; | |
152 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
153 | data->policy = tsk->policy; | |
154 | data->rt_priority = tsk->rt_priority; | |
155 | ||
156 | /* record this tasks comm */ | |
157 | tracing_record_cmdline(current); | |
158 | } | |
159 | ||
c7aafc54 IM |
160 | void check_pages(struct trace_array_cpu *data) |
161 | { | |
162 | struct page *page, *tmp; | |
163 | ||
164 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); | |
165 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); | |
166 | ||
167 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
168 | BUG_ON(page->lru.next->prev != &page->lru); | |
169 | BUG_ON(page->lru.prev->next != &page->lru); | |
170 | } | |
171 | } | |
172 | ||
173 | void *head_page(struct trace_array_cpu *data) | |
174 | { | |
175 | struct page *page; | |
176 | ||
177 | check_pages(data); | |
178 | if (list_empty(&data->trace_pages)) | |
179 | return NULL; | |
180 | ||
181 | page = list_entry(data->trace_pages.next, struct page, lru); | |
182 | BUG_ON(&page->lru == &data->trace_pages); | |
183 | ||
184 | return page_address(page); | |
185 | } | |
186 | ||
214023c3 SR |
187 | static notrace int |
188 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) | |
189 | { | |
190 | int len = (PAGE_SIZE - 1) - s->len; | |
191 | va_list ap; | |
b3806b43 | 192 | int ret; |
214023c3 SR |
193 | |
194 | if (!len) | |
195 | return 0; | |
196 | ||
197 | va_start(ap, fmt); | |
b3806b43 | 198 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
199 | va_end(ap); |
200 | ||
b3806b43 SR |
201 | /* If we can't write it all, don't bother writing anything */ |
202 | if (ret > len) | |
203 | return 0; | |
204 | ||
205 | s->len += ret; | |
214023c3 SR |
206 | |
207 | return len; | |
208 | } | |
209 | ||
210 | static notrace int | |
211 | trace_seq_puts(struct trace_seq *s, const char *str) | |
212 | { | |
213 | int len = strlen(str); | |
214 | ||
215 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 216 | return 0; |
214023c3 SR |
217 | |
218 | memcpy(s->buffer + s->len, str, len); | |
219 | s->len += len; | |
220 | ||
221 | return len; | |
222 | } | |
223 | ||
224 | static notrace int | |
225 | trace_seq_putc(struct trace_seq *s, unsigned char c) | |
226 | { | |
227 | if (s->len >= (PAGE_SIZE - 1)) | |
228 | return 0; | |
229 | ||
230 | s->buffer[s->len++] = c; | |
231 | ||
232 | return 1; | |
233 | } | |
234 | ||
cb0f12aa IM |
235 | static notrace int |
236 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) | |
237 | { | |
238 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
239 | return 0; | |
240 | ||
241 | memcpy(s->buffer + s->len, mem, len); | |
242 | s->len += len; | |
243 | ||
244 | return len; | |
245 | } | |
246 | ||
5e3ca0ec IM |
247 | #define HEX_CHARS 17 |
248 | ||
249 | static notrace int | |
250 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) | |
251 | { | |
252 | unsigned char hex[HEX_CHARS]; | |
253 | unsigned char *data; | |
254 | unsigned char byte; | |
255 | int i, j; | |
256 | ||
257 | BUG_ON(len >= HEX_CHARS); | |
258 | ||
259 | data = mem; | |
260 | ||
261 | #ifdef __BIG_ENDIAN | |
262 | for (i = 0, j = 0; i < len; i++) { | |
263 | #else | |
264 | for (i = len-1, j = 0; i >= 0; i--) { | |
265 | #endif | |
266 | byte = data[i]; | |
267 | ||
268 | hex[j] = byte & 0x0f; | |
269 | if (hex[j] >= 10) | |
270 | hex[j] += 'a' - 10; | |
271 | else | |
272 | hex[j] += '0'; | |
273 | j++; | |
274 | ||
275 | hex[j] = byte >> 4; | |
276 | if (hex[j] >= 10) | |
277 | hex[j] += 'a' - 10; | |
278 | else | |
279 | hex[j] += '0'; | |
280 | j++; | |
281 | } | |
282 | hex[j] = ' '; | |
283 | j++; | |
284 | ||
285 | return trace_seq_putmem(s, hex, j); | |
286 | } | |
287 | ||
214023c3 SR |
288 | static notrace void |
289 | trace_seq_reset(struct trace_seq *s) | |
290 | { | |
291 | s->len = 0; | |
292 | } | |
293 | ||
294 | static notrace void | |
295 | trace_print_seq(struct seq_file *m, struct trace_seq *s) | |
296 | { | |
297 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
298 | ||
299 | s->buffer[len] = 0; | |
300 | seq_puts(m, s->buffer); | |
301 | ||
302 | trace_seq_reset(s); | |
303 | } | |
304 | ||
c7aafc54 IM |
305 | notrace static void |
306 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) | |
307 | { | |
308 | struct list_head flip_pages; | |
309 | ||
310 | INIT_LIST_HEAD(&flip_pages); | |
311 | ||
93a588f4 | 312 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 313 | sizeof(struct trace_array_cpu) - |
93a588f4 | 314 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
315 | |
316 | check_pages(tr1); | |
317 | check_pages(tr2); | |
318 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
319 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
320 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
321 | BUG_ON(!list_empty(&flip_pages)); | |
322 | check_pages(tr1); | |
323 | check_pages(tr2); | |
324 | } | |
325 | ||
bc0c38d1 SR |
326 | notrace void |
327 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
328 | { | |
329 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
330 | int i; |
331 | ||
4c11d7ae SR |
332 | WARN_ON_ONCE(!irqs_disabled()); |
333 | spin_lock(&ftrace_max_lock); | |
bc0c38d1 SR |
334 | /* clear out all the previous traces */ |
335 | for_each_possible_cpu(i) { | |
336 | data = tr->data[i]; | |
c7aafc54 | 337 | flip_trace(max_tr.data[i], data); |
89b2f978 | 338 | tracing_reset(data); |
bc0c38d1 SR |
339 | } |
340 | ||
341 | __update_max_tr(tr, tsk, cpu); | |
4c11d7ae | 342 | spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
343 | } |
344 | ||
345 | /** | |
346 | * update_max_tr_single - only copy one trace over, and reset the rest | |
347 | * @tr - tracer | |
348 | * @tsk - task with the latency | |
349 | * @cpu - the cpu of the buffer to copy. | |
350 | */ | |
351 | notrace void | |
352 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
353 | { | |
354 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
355 | int i; |
356 | ||
4c11d7ae SR |
357 | WARN_ON_ONCE(!irqs_disabled()); |
358 | spin_lock(&ftrace_max_lock); | |
bc0c38d1 SR |
359 | for_each_possible_cpu(i) |
360 | tracing_reset(max_tr.data[i]); | |
361 | ||
c7aafc54 | 362 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 363 | tracing_reset(data); |
bc0c38d1 SR |
364 | |
365 | __update_max_tr(tr, tsk, cpu); | |
4c11d7ae | 366 | spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
367 | } |
368 | ||
369 | int register_tracer(struct tracer *type) | |
370 | { | |
371 | struct tracer *t; | |
372 | int len; | |
373 | int ret = 0; | |
374 | ||
375 | if (!type->name) { | |
376 | pr_info("Tracer must have a name\n"); | |
377 | return -1; | |
378 | } | |
379 | ||
380 | mutex_lock(&trace_types_lock); | |
381 | for (t = trace_types; t; t = t->next) { | |
382 | if (strcmp(type->name, t->name) == 0) { | |
383 | /* already found */ | |
384 | pr_info("Trace %s already registered\n", | |
385 | type->name); | |
386 | ret = -1; | |
387 | goto out; | |
388 | } | |
389 | } | |
390 | ||
60a11774 SR |
391 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
392 | if (type->selftest) { | |
393 | struct tracer *saved_tracer = current_trace; | |
394 | struct trace_array_cpu *data; | |
395 | struct trace_array *tr = &global_trace; | |
396 | int saved_ctrl = tr->ctrl; | |
397 | int i; | |
398 | /* | |
399 | * Run a selftest on this tracer. | |
400 | * Here we reset the trace buffer, and set the current | |
401 | * tracer to be this tracer. The tracer can then run some | |
402 | * internal tracing to verify that everything is in order. | |
403 | * If we fail, we do not register this tracer. | |
404 | */ | |
405 | for_each_possible_cpu(i) { | |
60a11774 | 406 | data = tr->data[i]; |
c7aafc54 IM |
407 | if (!head_page(data)) |
408 | continue; | |
60a11774 SR |
409 | tracing_reset(data); |
410 | } | |
411 | current_trace = type; | |
412 | tr->ctrl = 0; | |
413 | /* the test is responsible for initializing and enabling */ | |
414 | pr_info("Testing tracer %s: ", type->name); | |
415 | ret = type->selftest(type, tr); | |
416 | /* the test is responsible for resetting too */ | |
417 | current_trace = saved_tracer; | |
418 | tr->ctrl = saved_ctrl; | |
419 | if (ret) { | |
420 | printk(KERN_CONT "FAILED!\n"); | |
421 | goto out; | |
422 | } | |
1d4db00a SR |
423 | /* Only reset on passing, to avoid touching corrupted buffers */ |
424 | for_each_possible_cpu(i) { | |
425 | data = tr->data[i]; | |
426 | if (!head_page(data)) | |
427 | continue; | |
428 | tracing_reset(data); | |
429 | } | |
60a11774 SR |
430 | printk(KERN_CONT "PASSED\n"); |
431 | } | |
432 | #endif | |
433 | ||
bc0c38d1 SR |
434 | type->next = trace_types; |
435 | trace_types = type; | |
436 | len = strlen(type->name); | |
437 | if (len > max_tracer_type_len) | |
438 | max_tracer_type_len = len; | |
60a11774 | 439 | |
bc0c38d1 SR |
440 | out: |
441 | mutex_unlock(&trace_types_lock); | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
446 | void unregister_tracer(struct tracer *type) | |
447 | { | |
448 | struct tracer **t; | |
449 | int len; | |
450 | ||
451 | mutex_lock(&trace_types_lock); | |
452 | for (t = &trace_types; *t; t = &(*t)->next) { | |
453 | if (*t == type) | |
454 | goto found; | |
455 | } | |
456 | pr_info("Trace %s not registered\n", type->name); | |
457 | goto out; | |
458 | ||
459 | found: | |
460 | *t = (*t)->next; | |
461 | if (strlen(type->name) != max_tracer_type_len) | |
462 | goto out; | |
463 | ||
464 | max_tracer_type_len = 0; | |
465 | for (t = &trace_types; *t; t = &(*t)->next) { | |
466 | len = strlen((*t)->name); | |
467 | if (len > max_tracer_type_len) | |
468 | max_tracer_type_len = len; | |
469 | } | |
470 | out: | |
471 | mutex_unlock(&trace_types_lock); | |
472 | } | |
473 | ||
4e3c3333 | 474 | notrace void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
475 | { |
476 | data->trace_idx = 0; | |
93a588f4 SR |
477 | data->trace_head = data->trace_tail = head_page(data); |
478 | data->trace_head_idx = 0; | |
479 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
480 | } |
481 | ||
bc0c38d1 SR |
482 | #define SAVED_CMDLINES 128 |
483 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
484 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
485 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
486 | static int cmdline_idx; | |
487 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
488 | atomic_t trace_record_cmdline_disabled; | |
489 | ||
490 | static void trace_init_cmdlines(void) | |
491 | { | |
492 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
493 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
494 | cmdline_idx = 0; | |
495 | } | |
496 | ||
497 | notrace void trace_stop_cmdline_recording(void); | |
498 | ||
4e3c3333 | 499 | static notrace void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
500 | { |
501 | unsigned map; | |
502 | unsigned idx; | |
503 | ||
504 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
505 | return; | |
506 | ||
507 | /* | |
508 | * It's not the end of the world if we don't get | |
509 | * the lock, but we also don't want to spin | |
510 | * nor do we want to disable interrupts, | |
511 | * so if we miss here, then better luck next time. | |
512 | */ | |
513 | if (!spin_trylock(&trace_cmdline_lock)) | |
514 | return; | |
515 | ||
516 | idx = map_pid_to_cmdline[tsk->pid]; | |
517 | if (idx >= SAVED_CMDLINES) { | |
518 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
519 | ||
520 | map = map_cmdline_to_pid[idx]; | |
521 | if (map <= PID_MAX_DEFAULT) | |
522 | map_pid_to_cmdline[map] = (unsigned)-1; | |
523 | ||
524 | map_pid_to_cmdline[tsk->pid] = idx; | |
525 | ||
526 | cmdline_idx = idx; | |
527 | } | |
528 | ||
529 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
530 | ||
531 | spin_unlock(&trace_cmdline_lock); | |
532 | } | |
533 | ||
534 | static notrace char *trace_find_cmdline(int pid) | |
535 | { | |
536 | char *cmdline = "<...>"; | |
537 | unsigned map; | |
538 | ||
539 | if (!pid) | |
540 | return "<idle>"; | |
541 | ||
542 | if (pid > PID_MAX_DEFAULT) | |
543 | goto out; | |
544 | ||
545 | map = map_pid_to_cmdline[pid]; | |
546 | if (map >= SAVED_CMDLINES) | |
547 | goto out; | |
548 | ||
549 | cmdline = saved_cmdlines[map]; | |
550 | ||
551 | out: | |
552 | return cmdline; | |
553 | } | |
554 | ||
555 | notrace void tracing_record_cmdline(struct task_struct *tsk) | |
556 | { | |
557 | if (atomic_read(&trace_record_cmdline_disabled)) | |
558 | return; | |
559 | ||
560 | trace_save_cmdline(tsk); | |
561 | } | |
562 | ||
93a588f4 SR |
563 | static inline notrace struct list_head * |
564 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) | |
565 | { | |
566 | /* | |
567 | * Roundrobin - but skip the head (which is not a real page): | |
568 | */ | |
569 | next = next->next; | |
570 | if (unlikely(next == &data->trace_pages)) | |
571 | next = next->next; | |
572 | BUG_ON(next == &data->trace_pages); | |
573 | ||
574 | return next; | |
575 | } | |
576 | ||
577 | static inline notrace void * | |
578 | trace_next_page(struct trace_array_cpu *data, void *addr) | |
579 | { | |
580 | struct list_head *next; | |
581 | struct page *page; | |
582 | ||
583 | page = virt_to_page(addr); | |
584 | ||
585 | next = trace_next_list(data, &page->lru); | |
586 | page = list_entry(next, struct page, lru); | |
587 | ||
588 | return page_address(page); | |
589 | } | |
590 | ||
bc0c38d1 | 591 | static inline notrace struct trace_entry * |
c7aafc54 | 592 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
593 | { |
594 | unsigned long idx, idx_next; | |
595 | struct trace_entry *entry; | |
596 | ||
4c11d7ae | 597 | data->trace_idx++; |
93a588f4 | 598 | idx = data->trace_head_idx; |
bc0c38d1 SR |
599 | idx_next = idx + 1; |
600 | ||
c7aafc54 IM |
601 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
602 | ||
93a588f4 | 603 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
604 | |
605 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 606 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
607 | idx_next = 0; |
608 | } | |
609 | ||
93a588f4 SR |
610 | if (data->trace_head == data->trace_tail && |
611 | idx_next == data->trace_tail_idx) { | |
612 | /* overrun */ | |
613 | data->trace_tail_idx++; | |
614 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
615 | data->trace_tail = | |
616 | trace_next_page(data, data->trace_tail); | |
617 | data->trace_tail_idx = 0; | |
618 | } | |
619 | } | |
620 | ||
621 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
622 | |
623 | return entry; | |
624 | } | |
625 | ||
626 | static inline notrace void | |
c7aafc54 | 627 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
628 | { |
629 | struct task_struct *tsk = current; | |
630 | unsigned long pc; | |
631 | ||
632 | pc = preempt_count(); | |
633 | ||
c7aafc54 IM |
634 | entry->preempt_count = pc & 0xff; |
635 | entry->pid = tsk->pid; | |
750ed1a4 | 636 | entry->t = ftrace_now(raw_smp_processor_id()); |
bc0c38d1 SR |
637 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
638 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | | |
639 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
640 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
641 | } | |
642 | ||
643 | notrace void | |
6fb44b71 SR |
644 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
645 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
646 | { |
647 | struct trace_entry *entry; | |
dcb6308f | 648 | unsigned long irq_flags; |
bc0c38d1 | 649 | |
dcb6308f | 650 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 651 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 652 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
653 | entry->type = TRACE_FN; |
654 | entry->fn.ip = ip; | |
655 | entry->fn.parent_ip = parent_ip; | |
dcb6308f | 656 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
657 | |
658 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
659 | wake_up (&trace_wait); | |
bc0c38d1 SR |
660 | } |
661 | ||
2e0f5761 IM |
662 | notrace void |
663 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, | |
664 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
665 | { | |
666 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 667 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
668 | } |
669 | ||
f0a920d5 IM |
670 | notrace void |
671 | trace_special(struct trace_array *tr, struct trace_array_cpu *data, | |
672 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
673 | { | |
674 | struct trace_entry *entry; | |
dcb6308f | 675 | unsigned long irq_flags; |
f0a920d5 | 676 | |
dcb6308f | 677 | spin_lock_irqsave(&data->lock, irq_flags); |
f0a920d5 IM |
678 | entry = tracing_get_trace_entry(tr, data); |
679 | tracing_generic_entry_update(entry, 0); | |
680 | entry->type = TRACE_SPECIAL; | |
681 | entry->special.arg1 = arg1; | |
682 | entry->special.arg2 = arg2; | |
683 | entry->special.arg3 = arg3; | |
dcb6308f | 684 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
685 | |
686 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
687 | wake_up (&trace_wait); | |
f0a920d5 IM |
688 | } |
689 | ||
bc0c38d1 SR |
690 | notrace void |
691 | tracing_sched_switch_trace(struct trace_array *tr, | |
692 | struct trace_array_cpu *data, | |
693 | struct task_struct *prev, struct task_struct *next, | |
694 | unsigned long flags) | |
695 | { | |
696 | struct trace_entry *entry; | |
dcb6308f | 697 | unsigned long irq_flags; |
bc0c38d1 | 698 | |
dcb6308f | 699 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 700 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
701 | tracing_generic_entry_update(entry, flags); |
702 | entry->type = TRACE_CTX; | |
703 | entry->ctx.prev_pid = prev->pid; | |
704 | entry->ctx.prev_prio = prev->prio; | |
705 | entry->ctx.prev_state = prev->state; | |
706 | entry->ctx.next_pid = next->pid; | |
707 | entry->ctx.next_prio = next->prio; | |
dcb6308f | 708 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
709 | |
710 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
711 | wake_up (&trace_wait); | |
bc0c38d1 SR |
712 | } |
713 | ||
2e0f5761 IM |
714 | #ifdef CONFIG_FTRACE |
715 | static notrace void | |
716 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
717 | { | |
718 | struct trace_array *tr = &global_trace; | |
719 | struct trace_array_cpu *data; | |
720 | unsigned long flags; | |
721 | long disabled; | |
722 | int cpu; | |
723 | ||
724 | if (unlikely(!tracer_enabled)) | |
725 | return; | |
726 | ||
727 | local_irq_save(flags); | |
728 | cpu = raw_smp_processor_id(); | |
729 | data = tr->data[cpu]; | |
730 | disabled = atomic_inc_return(&data->disabled); | |
731 | ||
732 | if (likely(disabled == 1)) | |
6fb44b71 | 733 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
734 | |
735 | atomic_dec(&data->disabled); | |
736 | local_irq_restore(flags); | |
737 | } | |
738 | ||
739 | static struct ftrace_ops trace_ops __read_mostly = | |
740 | { | |
741 | .func = function_trace_call, | |
742 | }; | |
743 | ||
744 | notrace void tracing_start_function_trace(void) | |
745 | { | |
746 | register_ftrace_function(&trace_ops); | |
747 | } | |
748 | ||
749 | notrace void tracing_stop_function_trace(void) | |
750 | { | |
751 | unregister_ftrace_function(&trace_ops); | |
752 | } | |
753 | #endif | |
754 | ||
bc0c38d1 SR |
755 | enum trace_file_type { |
756 | TRACE_FILE_LAT_FMT = 1, | |
757 | }; | |
758 | ||
759 | static struct trace_entry * | |
4c11d7ae SR |
760 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
761 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 762 | { |
4c11d7ae SR |
763 | struct page *page; |
764 | struct trace_entry *array; | |
bc0c38d1 | 765 | |
4c11d7ae | 766 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
767 | iter->next_idx[cpu] >= data->trace_idx || |
768 | (data->trace_head == data->trace_tail && | |
769 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
770 | return NULL; |
771 | ||
4c11d7ae | 772 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
773 | /* Initialize the iterator for this cpu trace buffer */ |
774 | WARN_ON(!data->trace_tail); | |
775 | page = virt_to_page(data->trace_tail); | |
776 | iter->next_page[cpu] = &page->lru; | |
777 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 778 | } |
bc0c38d1 | 779 | |
4c11d7ae | 780 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
781 | BUG_ON(&data->trace_pages == &page->lru); |
782 | ||
4c11d7ae SR |
783 | array = page_address(page); |
784 | ||
93a588f4 | 785 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 786 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
787 | } |
788 | ||
2e0f5761 | 789 | static struct trace_entry * notrace |
bc0c38d1 SR |
790 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
791 | { | |
792 | struct trace_array *tr = iter->tr; | |
793 | struct trace_entry *ent, *next = NULL; | |
794 | int next_cpu = -1; | |
795 | int cpu; | |
796 | ||
797 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 798 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 799 | continue; |
4c11d7ae | 800 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
801 | /* |
802 | * Pick the entry with the smallest timestamp: | |
803 | */ | |
804 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
805 | next = ent; |
806 | next_cpu = cpu; | |
807 | } | |
808 | } | |
809 | ||
810 | if (ent_cpu) | |
811 | *ent_cpu = next_cpu; | |
812 | ||
813 | return next; | |
814 | } | |
815 | ||
8c523a9d | 816 | static notrace void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 817 | { |
b3806b43 SR |
818 | iter->idx++; |
819 | iter->next_idx[iter->cpu]++; | |
820 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 821 | |
b3806b43 SR |
822 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
823 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 824 | |
b3806b43 SR |
825 | iter->next_page_idx[iter->cpu] = 0; |
826 | iter->next_page[iter->cpu] = | |
827 | trace_next_list(data, iter->next_page[iter->cpu]); | |
828 | } | |
829 | } | |
bc0c38d1 | 830 | |
8c523a9d | 831 | static notrace void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
832 | { |
833 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
834 | ||
835 | data->trace_tail_idx++; | |
836 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
837 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
838 | data->trace_tail_idx = 0; | |
839 | } | |
4e3c3333 | 840 | |
b3806b43 SR |
841 | /* Check if we empty it, then reset the index */ |
842 | if (data->trace_head == data->trace_tail && | |
843 | data->trace_head_idx == data->trace_tail_idx) | |
844 | data->trace_idx = 0; | |
b3806b43 SR |
845 | } |
846 | ||
8c523a9d | 847 | static notrace void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
848 | { |
849 | struct trace_entry *next; | |
850 | int next_cpu = -1; | |
851 | ||
852 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 853 | |
4e3c3333 IM |
854 | iter->prev_ent = iter->ent; |
855 | iter->prev_cpu = iter->cpu; | |
856 | ||
bc0c38d1 SR |
857 | iter->ent = next; |
858 | iter->cpu = next_cpu; | |
859 | ||
b3806b43 SR |
860 | if (next) |
861 | trace_iterator_increment(iter); | |
862 | ||
bc0c38d1 SR |
863 | return next ? iter : NULL; |
864 | } | |
865 | ||
4e3c3333 | 866 | static notrace void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
867 | { |
868 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
869 | void *last_ent = iter->ent; |
870 | int i = (int)*pos; | |
4e3c3333 | 871 | void *ent; |
bc0c38d1 SR |
872 | |
873 | (*pos)++; | |
874 | ||
875 | /* can't go backwards */ | |
876 | if (iter->idx > i) | |
877 | return NULL; | |
878 | ||
879 | if (iter->idx < 0) | |
880 | ent = find_next_entry_inc(iter); | |
881 | else | |
882 | ent = iter; | |
883 | ||
884 | while (ent && iter->idx < i) | |
885 | ent = find_next_entry_inc(iter); | |
886 | ||
887 | iter->pos = *pos; | |
888 | ||
889 | if (last_ent && !ent) | |
890 | seq_puts(m, "\n\nvim:ft=help\n"); | |
891 | ||
892 | return ent; | |
893 | } | |
894 | ||
895 | static void *s_start(struct seq_file *m, loff_t *pos) | |
896 | { | |
897 | struct trace_iterator *iter = m->private; | |
898 | void *p = NULL; | |
899 | loff_t l = 0; | |
900 | int i; | |
901 | ||
902 | mutex_lock(&trace_types_lock); | |
903 | ||
904 | if (!current_trace || current_trace != iter->trace) | |
905 | return NULL; | |
906 | ||
907 | atomic_inc(&trace_record_cmdline_disabled); | |
908 | ||
909 | /* let the tracer grab locks here if needed */ | |
910 | if (current_trace->start) | |
911 | current_trace->start(iter); | |
912 | ||
913 | if (*pos != iter->pos) { | |
914 | iter->ent = NULL; | |
915 | iter->cpu = 0; | |
916 | iter->idx = -1; | |
4e3c3333 IM |
917 | iter->prev_ent = NULL; |
918 | iter->prev_cpu = -1; | |
bc0c38d1 | 919 | |
4c11d7ae | 920 | for_each_possible_cpu(i) { |
bc0c38d1 | 921 | iter->next_idx[i] = 0; |
4c11d7ae SR |
922 | iter->next_page[i] = NULL; |
923 | } | |
bc0c38d1 SR |
924 | |
925 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
926 | ; | |
927 | ||
928 | } else { | |
4c11d7ae | 929 | l = *pos - 1; |
bc0c38d1 SR |
930 | p = s_next(m, p, &l); |
931 | } | |
932 | ||
933 | return p; | |
934 | } | |
935 | ||
936 | static void s_stop(struct seq_file *m, void *p) | |
937 | { | |
938 | struct trace_iterator *iter = m->private; | |
939 | ||
940 | atomic_dec(&trace_record_cmdline_disabled); | |
941 | ||
942 | /* let the tracer release locks here if needed */ | |
943 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
944 | iter->trace->stop(iter); | |
945 | ||
946 | mutex_unlock(&trace_types_lock); | |
947 | } | |
948 | ||
b3806b43 | 949 | static int |
214023c3 | 950 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
951 | { |
952 | #ifdef CONFIG_KALLSYMS | |
953 | char str[KSYM_SYMBOL_LEN]; | |
954 | ||
955 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
956 | ||
b3806b43 | 957 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 958 | #endif |
b3806b43 | 959 | return 1; |
bc0c38d1 SR |
960 | } |
961 | ||
b3806b43 | 962 | static int |
214023c3 SR |
963 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
964 | unsigned long address) | |
bc0c38d1 SR |
965 | { |
966 | #ifdef CONFIG_KALLSYMS | |
967 | char str[KSYM_SYMBOL_LEN]; | |
968 | ||
969 | sprint_symbol(str, address); | |
b3806b43 | 970 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 971 | #endif |
b3806b43 | 972 | return 1; |
bc0c38d1 SR |
973 | } |
974 | ||
975 | #ifndef CONFIG_64BIT | |
976 | # define IP_FMT "%08lx" | |
977 | #else | |
978 | # define IP_FMT "%016lx" | |
979 | #endif | |
980 | ||
b3806b43 | 981 | static notrace int |
214023c3 | 982 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 983 | { |
b3806b43 SR |
984 | int ret; |
985 | ||
986 | if (!ip) | |
987 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
988 | |
989 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 990 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 991 | else |
b3806b43 SR |
992 | ret = seq_print_sym_short(s, "%s", ip); |
993 | ||
994 | if (!ret) | |
995 | return 0; | |
bc0c38d1 SR |
996 | |
997 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
998 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
999 | return ret; | |
bc0c38d1 SR |
1000 | } |
1001 | ||
4e3c3333 | 1002 | static notrace void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1003 | { |
1004 | seq_puts(m, "# _------=> CPU# \n"); | |
1005 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1006 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1007 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1008 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1009 | seq_puts(m, "# |||| / \n"); | |
1010 | seq_puts(m, "# ||||| delay \n"); | |
1011 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1012 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1013 | } | |
1014 | ||
4e3c3333 | 1015 | static notrace void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1016 | { |
1017 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1018 | seq_puts(m, "# | | | | |\n"); | |
1019 | } | |
1020 | ||
1021 | ||
4e3c3333 | 1022 | static notrace void |
bc0c38d1 SR |
1023 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1024 | { | |
1025 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1026 | struct trace_array *tr = iter->tr; | |
1027 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1028 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1029 | unsigned long total = 0; |
1030 | unsigned long entries = 0; | |
bc0c38d1 SR |
1031 | int cpu; |
1032 | const char *name = "preemption"; | |
1033 | ||
1034 | if (type) | |
1035 | name = type->name; | |
1036 | ||
1037 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1038 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1039 | total += tr->data[cpu]->trace_idx; |
1040 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1041 | entries += tr->entries; |
4c11d7ae | 1042 | else |
bc0c38d1 SR |
1043 | entries += tr->data[cpu]->trace_idx; |
1044 | } | |
1045 | } | |
1046 | ||
1047 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1048 | name, UTS_RELEASE); | |
1049 | seq_puts(m, "-----------------------------------" | |
1050 | "---------------------------------\n"); | |
1051 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1052 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1053 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1054 | entries, |
4c11d7ae | 1055 | total, |
bc0c38d1 SR |
1056 | tr->cpu, |
1057 | #if defined(CONFIG_PREEMPT_NONE) | |
1058 | "server", | |
1059 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1060 | "desktop", | |
1061 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1062 | "preempt", | |
1063 | #else | |
1064 | "unknown", | |
1065 | #endif | |
1066 | /* These are reserved for later use */ | |
1067 | 0, 0, 0, 0); | |
1068 | #ifdef CONFIG_SMP | |
1069 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1070 | #else | |
1071 | seq_puts(m, ")\n"); | |
1072 | #endif | |
1073 | seq_puts(m, " -----------------\n"); | |
1074 | seq_printf(m, " | task: %.16s-%d " | |
1075 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1076 | data->comm, data->pid, data->uid, data->nice, | |
1077 | data->policy, data->rt_priority); | |
1078 | seq_puts(m, " -----------------\n"); | |
1079 | ||
1080 | if (data->critical_start) { | |
1081 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1082 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1083 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1084 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1085 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1086 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1087 | seq_puts(m, "\n"); |
1088 | } | |
1089 | ||
1090 | seq_puts(m, "\n"); | |
1091 | } | |
1092 | ||
4e3c3333 | 1093 | static notrace void |
214023c3 | 1094 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1095 | { |
1096 | int hardirq, softirq; | |
1097 | char *comm; | |
1098 | ||
1099 | comm = trace_find_cmdline(entry->pid); | |
1100 | ||
214023c3 SR |
1101 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1102 | trace_seq_printf(s, "%d", cpu); | |
1103 | trace_seq_printf(s, "%c%c", | |
1104 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1105 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1106 | |
1107 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1108 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
1109 | if (hardirq && softirq) | |
214023c3 | 1110 | trace_seq_putc(s, 'H'); |
bc0c38d1 SR |
1111 | else { |
1112 | if (hardirq) | |
214023c3 | 1113 | trace_seq_putc(s, 'h'); |
bc0c38d1 SR |
1114 | else { |
1115 | if (softirq) | |
214023c3 | 1116 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1117 | else |
214023c3 | 1118 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1119 | } |
1120 | } | |
1121 | ||
1122 | if (entry->preempt_count) | |
214023c3 | 1123 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1124 | else |
214023c3 | 1125 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1126 | } |
1127 | ||
1128 | unsigned long preempt_mark_thresh = 100; | |
1129 | ||
4e3c3333 | 1130 | static notrace void |
214023c3 | 1131 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1132 | unsigned long rel_usecs) |
1133 | { | |
214023c3 | 1134 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1135 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1136 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1137 | else if (rel_usecs > 1) |
214023c3 | 1138 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1139 | else |
214023c3 | 1140 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1141 | } |
1142 | ||
1143 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1144 | ||
f9896bf3 | 1145 | static notrace int |
214023c3 | 1146 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1147 | { |
214023c3 | 1148 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1149 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1150 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1151 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1152 | struct trace_entry *entry = iter->ent; | |
1153 | unsigned long abs_usecs; | |
1154 | unsigned long rel_usecs; | |
1155 | char *comm; | |
1156 | int S; | |
1157 | ||
1158 | if (!next_entry) | |
1159 | next_entry = entry; | |
1160 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1161 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1162 | ||
1163 | if (verbose) { | |
1164 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1165 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1166 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1167 | comm, | |
1168 | entry->pid, cpu, entry->flags, | |
1169 | entry->preempt_count, trace_idx, | |
1170 | ns2usecs(entry->t), | |
1171 | abs_usecs/1000, | |
1172 | abs_usecs % 1000, rel_usecs/1000, | |
1173 | rel_usecs % 1000); | |
bc0c38d1 | 1174 | } else { |
214023c3 SR |
1175 | lat_print_generic(s, entry, cpu); |
1176 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1177 | } |
1178 | switch (entry->type) { | |
1179 | case TRACE_FN: | |
214023c3 SR |
1180 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1181 | trace_seq_puts(s, " ("); | |
1182 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1183 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1184 | break; |
1185 | case TRACE_CTX: | |
1186 | S = entry->ctx.prev_state < sizeof(state_to_char) ? | |
1187 | state_to_char[entry->ctx.prev_state] : 'X'; | |
1188 | comm = trace_find_cmdline(entry->ctx.next_pid); | |
214023c3 SR |
1189 | trace_seq_printf(s, " %d:%d:%c --> %d:%d %s\n", |
1190 | entry->ctx.prev_pid, | |
1191 | entry->ctx.prev_prio, | |
1192 | S, | |
1193 | entry->ctx.next_pid, | |
1194 | entry->ctx.next_prio, | |
1195 | comm); | |
bc0c38d1 | 1196 | break; |
f0a920d5 IM |
1197 | case TRACE_SPECIAL: |
1198 | trace_seq_printf(s, " %lx %lx %lx\n", | |
1199 | entry->special.arg1, | |
1200 | entry->special.arg2, | |
1201 | entry->special.arg3); | |
1202 | break; | |
89b2f978 | 1203 | default: |
214023c3 | 1204 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1205 | } |
f9896bf3 | 1206 | return 1; |
bc0c38d1 SR |
1207 | } |
1208 | ||
f9896bf3 | 1209 | static notrace int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1210 | { |
214023c3 | 1211 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1212 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1213 | struct trace_entry *entry; |
bc0c38d1 SR |
1214 | unsigned long usec_rem; |
1215 | unsigned long long t; | |
1216 | unsigned long secs; | |
1217 | char *comm; | |
1218 | int S; | |
b3806b43 | 1219 | int ret; |
bc0c38d1 | 1220 | |
4e3c3333 IM |
1221 | entry = iter->ent; |
1222 | ||
bc0c38d1 SR |
1223 | comm = trace_find_cmdline(iter->ent->pid); |
1224 | ||
cdd31cd2 | 1225 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1226 | usec_rem = do_div(t, 1000000ULL); |
1227 | secs = (unsigned long)t; | |
1228 | ||
b3806b43 SR |
1229 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
1230 | if (!ret) | |
1231 | return 0; | |
1232 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1233 | if (!ret) | |
1234 | return 0; | |
1235 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1236 | if (!ret) | |
1237 | return 0; | |
bc0c38d1 SR |
1238 | |
1239 | switch (entry->type) { | |
1240 | case TRACE_FN: | |
b3806b43 SR |
1241 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1242 | if (!ret) | |
1243 | return 0; | |
bc0c38d1 SR |
1244 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1245 | entry->fn.parent_ip) { | |
b3806b43 SR |
1246 | ret = trace_seq_printf(s, " <-"); |
1247 | if (!ret) | |
1248 | return 0; | |
1249 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1250 | sym_flags); | |
1251 | if (!ret) | |
1252 | return 0; | |
bc0c38d1 | 1253 | } |
b3806b43 SR |
1254 | ret = trace_seq_printf(s, "\n"); |
1255 | if (!ret) | |
1256 | return 0; | |
bc0c38d1 SR |
1257 | break; |
1258 | case TRACE_CTX: | |
1259 | S = entry->ctx.prev_state < sizeof(state_to_char) ? | |
1260 | state_to_char[entry->ctx.prev_state] : 'X'; | |
b3806b43 SR |
1261 | ret = trace_seq_printf(s, " %d:%d:%c ==> %d:%d\n", |
1262 | entry->ctx.prev_pid, | |
1263 | entry->ctx.prev_prio, | |
1264 | S, | |
1265 | entry->ctx.next_pid, | |
1266 | entry->ctx.next_prio); | |
1267 | if (!ret) | |
1268 | return 0; | |
bc0c38d1 | 1269 | break; |
f0a920d5 IM |
1270 | case TRACE_SPECIAL: |
1271 | ret = trace_seq_printf(s, " %lx %lx %lx\n", | |
1272 | entry->special.arg1, | |
1273 | entry->special.arg2, | |
1274 | entry->special.arg3); | |
1275 | if (!ret) | |
1276 | return 0; | |
1277 | break; | |
bc0c38d1 | 1278 | } |
b3806b43 | 1279 | return 1; |
bc0c38d1 SR |
1280 | } |
1281 | ||
f9896bf3 IM |
1282 | static notrace int print_raw_fmt(struct trace_iterator *iter) |
1283 | { | |
1284 | struct trace_seq *s = &iter->seq; | |
1285 | struct trace_entry *entry; | |
1286 | int ret; | |
1287 | int S; | |
1288 | ||
1289 | entry = iter->ent; | |
1290 | ||
1291 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1292 | entry->pid, iter->cpu, entry->t); | |
1293 | if (!ret) | |
1294 | return 0; | |
1295 | ||
1296 | switch (entry->type) { | |
1297 | case TRACE_FN: | |
1298 | ret = trace_seq_printf(s, "%x %x\n", | |
1299 | entry->fn.ip, entry->fn.parent_ip); | |
1300 | if (!ret) | |
1301 | return 0; | |
1302 | break; | |
1303 | case TRACE_CTX: | |
1304 | S = entry->ctx.prev_state < sizeof(state_to_char) ? | |
1305 | state_to_char[entry->ctx.prev_state] : 'X'; | |
1306 | ret = trace_seq_printf(s, "%d %d %c %d %d\n", | |
1307 | entry->ctx.prev_pid, | |
1308 | entry->ctx.prev_prio, | |
1309 | S, | |
1310 | entry->ctx.next_pid, | |
1311 | entry->ctx.next_prio); | |
1312 | if (!ret) | |
1313 | return 0; | |
1314 | break; | |
f0a920d5 IM |
1315 | case TRACE_SPECIAL: |
1316 | ret = trace_seq_printf(s, " %lx %lx %lx\n", | |
1317 | entry->special.arg1, | |
1318 | entry->special.arg2, | |
1319 | entry->special.arg3); | |
1320 | if (!ret) | |
1321 | return 0; | |
1322 | break; | |
f9896bf3 IM |
1323 | } |
1324 | return 1; | |
1325 | } | |
1326 | ||
cb0f12aa IM |
1327 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1328 | do { \ | |
1329 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1330 | return 0; \ | |
1331 | } while (0) | |
1332 | ||
5e3ca0ec IM |
1333 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1334 | do { \ | |
1335 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1336 | return 0; \ | |
1337 | } while (0) | |
1338 | ||
1339 | static notrace int print_hex_fmt(struct trace_iterator *iter) | |
1340 | { | |
1341 | struct trace_seq *s = &iter->seq; | |
1342 | unsigned char newline = '\n'; | |
1343 | struct trace_entry *entry; | |
1344 | int S; | |
1345 | ||
1346 | entry = iter->ent; | |
1347 | ||
1348 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1349 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1350 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1351 | ||
1352 | switch (entry->type) { | |
1353 | case TRACE_FN: | |
1354 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1355 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1356 | break; | |
1357 | case TRACE_CTX: | |
1358 | S = entry->ctx.prev_state < sizeof(state_to_char) ? | |
1359 | state_to_char[entry->ctx.prev_state] : 'X'; | |
1360 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); | |
1361 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1362 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1363 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1364 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1365 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1366 | break; | |
1367 | case TRACE_SPECIAL: | |
1368 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); | |
1369 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1370 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1371 | break; | |
1372 | } | |
1373 | SEQ_PUT_FIELD_RET(s, newline); | |
1374 | ||
1375 | return 1; | |
1376 | } | |
1377 | ||
cb0f12aa IM |
1378 | static notrace int print_bin_fmt(struct trace_iterator *iter) |
1379 | { | |
1380 | struct trace_seq *s = &iter->seq; | |
1381 | struct trace_entry *entry; | |
1382 | ||
1383 | entry = iter->ent; | |
1384 | ||
1385 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1386 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1387 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1388 | ||
1389 | switch (entry->type) { | |
1390 | case TRACE_FN: | |
1391 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1392 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1393 | break; | |
1394 | case TRACE_CTX: | |
1395 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1396 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1397 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1398 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1399 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
1400 | break; | |
f0a920d5 IM |
1401 | case TRACE_SPECIAL: |
1402 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); | |
1403 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); | |
1404 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); | |
1405 | break; | |
cb0f12aa IM |
1406 | } |
1407 | return 1; | |
1408 | } | |
1409 | ||
bc0c38d1 SR |
1410 | static int trace_empty(struct trace_iterator *iter) |
1411 | { | |
1412 | struct trace_array_cpu *data; | |
1413 | int cpu; | |
1414 | ||
1415 | for_each_possible_cpu(cpu) { | |
1416 | data = iter->tr->data[cpu]; | |
1417 | ||
b3806b43 SR |
1418 | if (head_page(data) && data->trace_idx && |
1419 | (data->trace_tail != data->trace_head || | |
1420 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1421 | return 0; |
1422 | } | |
1423 | return 1; | |
1424 | } | |
1425 | ||
f9896bf3 IM |
1426 | static int print_trace_line(struct trace_iterator *iter) |
1427 | { | |
cb0f12aa IM |
1428 | if (trace_flags & TRACE_ITER_BIN) |
1429 | return print_bin_fmt(iter); | |
1430 | ||
5e3ca0ec IM |
1431 | if (trace_flags & TRACE_ITER_HEX) |
1432 | return print_hex_fmt(iter); | |
1433 | ||
f9896bf3 IM |
1434 | if (trace_flags & TRACE_ITER_RAW) |
1435 | return print_raw_fmt(iter); | |
1436 | ||
1437 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1438 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1439 | ||
1440 | return print_trace_fmt(iter); | |
1441 | } | |
1442 | ||
bc0c38d1 SR |
1443 | static int s_show(struct seq_file *m, void *v) |
1444 | { | |
1445 | struct trace_iterator *iter = v; | |
1446 | ||
1447 | if (iter->ent == NULL) { | |
1448 | if (iter->tr) { | |
1449 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1450 | seq_puts(m, "#\n"); | |
1451 | } | |
1452 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1453 | /* print nothing if the buffers are empty */ | |
1454 | if (trace_empty(iter)) | |
1455 | return 0; | |
1456 | print_trace_header(m, iter); | |
1457 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1458 | print_lat_help_header(m); | |
1459 | } else { | |
1460 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1461 | print_func_help_header(m); | |
1462 | } | |
1463 | } else { | |
f9896bf3 | 1464 | print_trace_line(iter); |
214023c3 | 1465 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1466 | } |
1467 | ||
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1472 | .start = s_start, |
1473 | .next = s_next, | |
1474 | .stop = s_stop, | |
1475 | .show = s_show, | |
bc0c38d1 SR |
1476 | }; |
1477 | ||
1478 | static struct trace_iterator notrace * | |
1479 | __tracing_open(struct inode *inode, struct file *file, int *ret) | |
1480 | { | |
1481 | struct trace_iterator *iter; | |
1482 | ||
60a11774 SR |
1483 | if (tracing_disabled) { |
1484 | *ret = -ENODEV; | |
1485 | return NULL; | |
1486 | } | |
1487 | ||
bc0c38d1 SR |
1488 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1489 | if (!iter) { | |
1490 | *ret = -ENOMEM; | |
1491 | goto out; | |
1492 | } | |
1493 | ||
1494 | mutex_lock(&trace_types_lock); | |
1495 | if (current_trace && current_trace->print_max) | |
1496 | iter->tr = &max_tr; | |
1497 | else | |
1498 | iter->tr = inode->i_private; | |
1499 | iter->trace = current_trace; | |
1500 | iter->pos = -1; | |
1501 | ||
1502 | /* TODO stop tracer */ | |
1503 | *ret = seq_open(file, &tracer_seq_ops); | |
1504 | if (!*ret) { | |
1505 | struct seq_file *m = file->private_data; | |
1506 | m->private = iter; | |
1507 | ||
1508 | /* stop the trace while dumping */ | |
1509 | if (iter->tr->ctrl) | |
1510 | tracer_enabled = 0; | |
1511 | ||
1512 | if (iter->trace && iter->trace->open) | |
1513 | iter->trace->open(iter); | |
1514 | } else { | |
1515 | kfree(iter); | |
1516 | iter = NULL; | |
1517 | } | |
1518 | mutex_unlock(&trace_types_lock); | |
1519 | ||
1520 | out: | |
1521 | return iter; | |
1522 | } | |
1523 | ||
1524 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1525 | { | |
60a11774 SR |
1526 | if (tracing_disabled) |
1527 | return -ENODEV; | |
1528 | ||
bc0c38d1 SR |
1529 | filp->private_data = inode->i_private; |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | int tracing_release(struct inode *inode, struct file *file) | |
1534 | { | |
1535 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1536 | struct trace_iterator *iter = m->private; | |
1537 | ||
1538 | mutex_lock(&trace_types_lock); | |
1539 | if (iter->trace && iter->trace->close) | |
1540 | iter->trace->close(iter); | |
1541 | ||
1542 | /* reenable tracing if it was previously enabled */ | |
1543 | if (iter->tr->ctrl) | |
1544 | tracer_enabled = 1; | |
1545 | mutex_unlock(&trace_types_lock); | |
1546 | ||
1547 | seq_release(inode, file); | |
1548 | kfree(iter); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | static int tracing_open(struct inode *inode, struct file *file) | |
1553 | { | |
1554 | int ret; | |
1555 | ||
1556 | __tracing_open(inode, file, &ret); | |
1557 | ||
1558 | return ret; | |
1559 | } | |
1560 | ||
1561 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1562 | { | |
1563 | struct trace_iterator *iter; | |
1564 | int ret; | |
1565 | ||
1566 | iter = __tracing_open(inode, file, &ret); | |
1567 | ||
1568 | if (!ret) | |
1569 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1570 | ||
1571 | return ret; | |
1572 | } | |
1573 | ||
1574 | ||
4e3c3333 | 1575 | static notrace void * |
bc0c38d1 SR |
1576 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1577 | { | |
1578 | struct tracer *t = m->private; | |
1579 | ||
1580 | (*pos)++; | |
1581 | ||
1582 | if (t) | |
1583 | t = t->next; | |
1584 | ||
1585 | m->private = t; | |
1586 | ||
1587 | return t; | |
1588 | } | |
1589 | ||
1590 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1591 | { | |
1592 | struct tracer *t = m->private; | |
1593 | loff_t l = 0; | |
1594 | ||
1595 | mutex_lock(&trace_types_lock); | |
1596 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1597 | ; | |
1598 | ||
1599 | return t; | |
1600 | } | |
1601 | ||
1602 | static void t_stop(struct seq_file *m, void *p) | |
1603 | { | |
1604 | mutex_unlock(&trace_types_lock); | |
1605 | } | |
1606 | ||
1607 | static int t_show(struct seq_file *m, void *v) | |
1608 | { | |
1609 | struct tracer *t = v; | |
1610 | ||
1611 | if (!t) | |
1612 | return 0; | |
1613 | ||
1614 | seq_printf(m, "%s", t->name); | |
1615 | if (t->next) | |
1616 | seq_putc(m, ' '); | |
1617 | else | |
1618 | seq_putc(m, '\n'); | |
1619 | ||
1620 | return 0; | |
1621 | } | |
1622 | ||
1623 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1624 | .start = t_start, |
1625 | .next = t_next, | |
1626 | .stop = t_stop, | |
1627 | .show = t_show, | |
bc0c38d1 SR |
1628 | }; |
1629 | ||
1630 | static int show_traces_open(struct inode *inode, struct file *file) | |
1631 | { | |
1632 | int ret; | |
1633 | ||
60a11774 SR |
1634 | if (tracing_disabled) |
1635 | return -ENODEV; | |
1636 | ||
bc0c38d1 SR |
1637 | ret = seq_open(file, &show_traces_seq_ops); |
1638 | if (!ret) { | |
1639 | struct seq_file *m = file->private_data; | |
1640 | m->private = trace_types; | |
1641 | } | |
1642 | ||
1643 | return ret; | |
1644 | } | |
1645 | ||
1646 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1647 | .open = tracing_open, |
1648 | .read = seq_read, | |
1649 | .llseek = seq_lseek, | |
1650 | .release = tracing_release, | |
bc0c38d1 SR |
1651 | }; |
1652 | ||
1653 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1654 | .open = tracing_lt_open, |
1655 | .read = seq_read, | |
1656 | .llseek = seq_lseek, | |
1657 | .release = tracing_release, | |
bc0c38d1 SR |
1658 | }; |
1659 | ||
1660 | static struct file_operations show_traces_fops = { | |
1661 | .open = show_traces_open, | |
1662 | .read = seq_read, | |
1663 | .release = seq_release, | |
1664 | }; | |
1665 | ||
1666 | static ssize_t | |
1667 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1668 | size_t cnt, loff_t *ppos) | |
1669 | { | |
1670 | char *buf; | |
1671 | int r = 0; | |
1672 | int len = 0; | |
1673 | int i; | |
1674 | ||
1675 | /* calulate max size */ | |
1676 | for (i = 0; trace_options[i]; i++) { | |
1677 | len += strlen(trace_options[i]); | |
1678 | len += 3; /* "no" and space */ | |
1679 | } | |
1680 | ||
1681 | /* +2 for \n and \0 */ | |
1682 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1683 | if (!buf) | |
1684 | return -ENOMEM; | |
1685 | ||
1686 | for (i = 0; trace_options[i]; i++) { | |
1687 | if (trace_flags & (1 << i)) | |
1688 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1689 | else | |
1690 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1691 | } | |
1692 | ||
1693 | r += sprintf(buf + r, "\n"); | |
1694 | WARN_ON(r >= len + 2); | |
1695 | ||
1696 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
1697 | buf, r); | |
1698 | ||
1699 | kfree(buf); | |
1700 | ||
1701 | return r; | |
1702 | } | |
1703 | ||
1704 | static ssize_t | |
1705 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1706 | size_t cnt, loff_t *ppos) | |
1707 | { | |
1708 | char buf[64]; | |
1709 | char *cmp = buf; | |
1710 | int neg = 0; | |
1711 | int i; | |
1712 | ||
1713 | if (cnt > 63) | |
1714 | cnt = 63; | |
1715 | ||
1716 | if (copy_from_user(&buf, ubuf, cnt)) | |
1717 | return -EFAULT; | |
1718 | ||
1719 | buf[cnt] = 0; | |
1720 | ||
1721 | if (strncmp(buf, "no", 2) == 0) { | |
1722 | neg = 1; | |
1723 | cmp += 2; | |
1724 | } | |
1725 | ||
1726 | for (i = 0; trace_options[i]; i++) { | |
1727 | int len = strlen(trace_options[i]); | |
1728 | ||
1729 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1730 | if (neg) | |
1731 | trace_flags &= ~(1 << i); | |
1732 | else | |
1733 | trace_flags |= (1 << i); | |
1734 | break; | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | filp->f_pos += cnt; | |
1739 | ||
1740 | return cnt; | |
1741 | } | |
1742 | ||
1743 | static struct file_operations tracing_iter_fops = { | |
1744 | .open = tracing_open_generic, | |
1745 | .read = tracing_iter_ctrl_read, | |
1746 | .write = tracing_iter_ctrl_write, | |
1747 | }; | |
1748 | ||
7bd2f24c IM |
1749 | static const char readme_msg[] = |
1750 | "tracing mini-HOWTO:\n\n" | |
1751 | "# mkdir /debug\n" | |
1752 | "# mount -t debugfs nodev /debug\n\n" | |
1753 | "# cat /debug/tracing/available_tracers\n" | |
1754 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1755 | "# cat /debug/tracing/current_tracer\n" | |
1756 | "none\n" | |
1757 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1758 | "# cat /debug/tracing/current_tracer\n" | |
1759 | "sched_switch\n" | |
1760 | "# cat /debug/tracing/iter_ctrl\n" | |
1761 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1762 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1763 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1764 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1765 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1766 | ; | |
1767 | ||
1768 | static ssize_t | |
1769 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1770 | size_t cnt, loff_t *ppos) | |
1771 | { | |
1772 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1773 | readme_msg, strlen(readme_msg)); | |
1774 | } | |
1775 | ||
1776 | static struct file_operations tracing_readme_fops = { | |
1777 | .open = tracing_open_generic, | |
1778 | .read = tracing_readme_read, | |
1779 | }; | |
1780 | ||
bc0c38d1 SR |
1781 | static ssize_t |
1782 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1783 | size_t cnt, loff_t *ppos) | |
1784 | { | |
1785 | struct trace_array *tr = filp->private_data; | |
1786 | char buf[64]; | |
1787 | int r; | |
1788 | ||
1789 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 1790 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1791 | } |
1792 | ||
1793 | static ssize_t | |
1794 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
1795 | size_t cnt, loff_t *ppos) | |
1796 | { | |
1797 | struct trace_array *tr = filp->private_data; | |
1798 | long val; | |
1799 | char buf[64]; | |
1800 | ||
1801 | if (cnt > 63) | |
1802 | cnt = 63; | |
1803 | ||
1804 | if (copy_from_user(&buf, ubuf, cnt)) | |
1805 | return -EFAULT; | |
1806 | ||
1807 | buf[cnt] = 0; | |
1808 | ||
1809 | val = simple_strtoul(buf, NULL, 10); | |
1810 | ||
1811 | val = !!val; | |
1812 | ||
1813 | mutex_lock(&trace_types_lock); | |
1814 | if (tr->ctrl ^ val) { | |
1815 | if (val) | |
1816 | tracer_enabled = 1; | |
1817 | else | |
1818 | tracer_enabled = 0; | |
1819 | ||
1820 | tr->ctrl = val; | |
1821 | ||
1822 | if (current_trace && current_trace->ctrl_update) | |
1823 | current_trace->ctrl_update(tr); | |
1824 | } | |
1825 | mutex_unlock(&trace_types_lock); | |
1826 | ||
1827 | filp->f_pos += cnt; | |
1828 | ||
1829 | return cnt; | |
1830 | } | |
1831 | ||
1832 | static ssize_t | |
1833 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
1834 | size_t cnt, loff_t *ppos) | |
1835 | { | |
1836 | char buf[max_tracer_type_len+2]; | |
1837 | int r; | |
1838 | ||
1839 | mutex_lock(&trace_types_lock); | |
1840 | if (current_trace) | |
1841 | r = sprintf(buf, "%s\n", current_trace->name); | |
1842 | else | |
1843 | r = sprintf(buf, "\n"); | |
1844 | mutex_unlock(&trace_types_lock); | |
1845 | ||
4bf39a94 | 1846 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1847 | } |
1848 | ||
1849 | static ssize_t | |
1850 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
1851 | size_t cnt, loff_t *ppos) | |
1852 | { | |
1853 | struct trace_array *tr = &global_trace; | |
1854 | struct tracer *t; | |
1855 | char buf[max_tracer_type_len+1]; | |
1856 | int i; | |
1857 | ||
1858 | if (cnt > max_tracer_type_len) | |
1859 | cnt = max_tracer_type_len; | |
1860 | ||
1861 | if (copy_from_user(&buf, ubuf, cnt)) | |
1862 | return -EFAULT; | |
1863 | ||
1864 | buf[cnt] = 0; | |
1865 | ||
1866 | /* strip ending whitespace. */ | |
1867 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
1868 | buf[i] = 0; | |
1869 | ||
1870 | mutex_lock(&trace_types_lock); | |
1871 | for (t = trace_types; t; t = t->next) { | |
1872 | if (strcmp(t->name, buf) == 0) | |
1873 | break; | |
1874 | } | |
1875 | if (!t || t == current_trace) | |
1876 | goto out; | |
1877 | ||
1878 | if (current_trace && current_trace->reset) | |
1879 | current_trace->reset(tr); | |
1880 | ||
1881 | current_trace = t; | |
1882 | if (t->init) | |
1883 | t->init(tr); | |
1884 | ||
1885 | out: | |
1886 | mutex_unlock(&trace_types_lock); | |
1887 | ||
1888 | filp->f_pos += cnt; | |
1889 | ||
1890 | return cnt; | |
1891 | } | |
1892 | ||
1893 | static ssize_t | |
1894 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
1895 | size_t cnt, loff_t *ppos) | |
1896 | { | |
1897 | unsigned long *ptr = filp->private_data; | |
1898 | char buf[64]; | |
1899 | int r; | |
1900 | ||
1901 | r = snprintf(buf, 64, "%ld\n", | |
1902 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); | |
1903 | if (r > 64) | |
1904 | r = 64; | |
4bf39a94 | 1905 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1906 | } |
1907 | ||
1908 | static ssize_t | |
1909 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
1910 | size_t cnt, loff_t *ppos) | |
1911 | { | |
1912 | long *ptr = filp->private_data; | |
1913 | long val; | |
1914 | char buf[64]; | |
1915 | ||
1916 | if (cnt > 63) | |
1917 | cnt = 63; | |
1918 | ||
1919 | if (copy_from_user(&buf, ubuf, cnt)) | |
1920 | return -EFAULT; | |
1921 | ||
1922 | buf[cnt] = 0; | |
1923 | ||
1924 | val = simple_strtoul(buf, NULL, 10); | |
1925 | ||
1926 | *ptr = val * 1000; | |
1927 | ||
1928 | return cnt; | |
1929 | } | |
1930 | ||
b3806b43 SR |
1931 | static atomic_t tracing_reader; |
1932 | ||
1933 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
1934 | { | |
1935 | struct trace_iterator *iter; | |
1936 | ||
1937 | if (tracing_disabled) | |
1938 | return -ENODEV; | |
1939 | ||
1940 | /* We only allow for reader of the pipe */ | |
1941 | if (atomic_inc_return(&tracing_reader) != 1) { | |
1942 | atomic_dec(&tracing_reader); | |
1943 | return -EBUSY; | |
1944 | } | |
1945 | ||
1946 | /* create a buffer to store the information to pass to userspace */ | |
1947 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
1948 | if (!iter) | |
1949 | return -ENOMEM; | |
1950 | ||
1951 | iter->tr = &global_trace; | |
1952 | ||
1953 | filp->private_data = iter; | |
1954 | ||
1955 | return 0; | |
1956 | } | |
1957 | ||
1958 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
1959 | { | |
1960 | struct trace_iterator *iter = file->private_data; | |
1961 | ||
1962 | kfree(iter); | |
1963 | atomic_dec(&tracing_reader); | |
1964 | ||
1965 | return 0; | |
1966 | } | |
1967 | ||
2a2cc8f7 SSP |
1968 | static unsigned int |
1969 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
1970 | { | |
1971 | struct trace_iterator *iter = filp->private_data; | |
1972 | ||
1973 | if (trace_flags & TRACE_ITER_BLOCK) { | |
1974 | /* | |
1975 | * Always select as readable when in blocking mode | |
1976 | */ | |
1977 | return POLLIN | POLLRDNORM; | |
1978 | } | |
1979 | else { | |
1980 | if (!trace_empty(iter)) | |
1981 | return POLLIN | POLLRDNORM; | |
1982 | poll_wait(filp, &trace_wait, poll_table); | |
1983 | if (!trace_empty(iter)) | |
1984 | return POLLIN | POLLRDNORM; | |
1985 | ||
1986 | return 0; | |
1987 | } | |
1988 | } | |
1989 | ||
b3806b43 SR |
1990 | /* |
1991 | * Consumer reader. | |
1992 | */ | |
1993 | static ssize_t | |
1994 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
1995 | size_t cnt, loff_t *ppos) | |
1996 | { | |
1997 | struct trace_iterator *iter = filp->private_data; | |
1998 | struct trace_array_cpu *data; | |
1999 | static cpumask_t mask; | |
b3806b43 SR |
2000 | static int start; |
2001 | unsigned long flags; | |
25770467 | 2002 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2003 | int ftrace_save; |
25770467 | 2004 | #endif |
b3806b43 SR |
2005 | int read = 0; |
2006 | int cpu; | |
2007 | int len; | |
2008 | int ret; | |
2009 | ||
2010 | /* return any leftover data */ | |
2011 | if (iter->seq.len > start) { | |
2012 | len = iter->seq.len - start; | |
2013 | if (cnt > len) | |
2014 | cnt = len; | |
2015 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2016 | if (ret) | |
2017 | cnt = -EFAULT; | |
2018 | ||
2019 | start += len; | |
2020 | ||
2021 | return cnt; | |
2022 | } | |
2023 | ||
2024 | trace_seq_reset(&iter->seq); | |
2025 | start = 0; | |
2026 | ||
2027 | while (trace_empty(iter)) { | |
2a2cc8f7 SSP |
2028 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
2029 | return -EWOULDBLOCK; | |
b3806b43 SR |
2030 | /* |
2031 | * This is a make-shift waitqueue. The reason we don't use | |
2032 | * an actual wait queue is because: | |
2033 | * 1) we only ever have one waiter | |
2034 | * 2) the tracing, traces all functions, we don't want | |
2035 | * the overhead of calling wake_up and friends | |
2036 | * (and tracing them too) | |
2037 | * Anyway, this is really very primitive wakeup. | |
2038 | */ | |
2039 | set_current_state(TASK_INTERRUPTIBLE); | |
2040 | iter->tr->waiter = current; | |
2041 | ||
2042 | /* sleep for one second, and try again. */ | |
2043 | schedule_timeout(HZ); | |
2044 | ||
2045 | iter->tr->waiter = NULL; | |
2046 | ||
2047 | if (signal_pending(current)) | |
2048 | return -EINTR; | |
2049 | ||
2050 | /* | |
2051 | * We block until we read something and tracing is disabled. | |
2052 | * We still block if tracing is disabled, but we have never | |
2053 | * read anything. This allows a user to cat this file, and | |
2054 | * then enable tracing. But after we have read something, | |
2055 | * we give an EOF when tracing is again disabled. | |
2056 | * | |
2057 | * iter->pos will be 0 if we haven't read anything. | |
2058 | */ | |
2059 | if (!tracer_enabled && iter->pos) | |
2060 | break; | |
2061 | ||
2062 | continue; | |
2063 | } | |
2064 | ||
2065 | /* stop when tracing is finished */ | |
2066 | if (trace_empty(iter)) | |
2067 | return 0; | |
2068 | ||
2069 | if (cnt >= PAGE_SIZE) | |
2070 | cnt = PAGE_SIZE - 1; | |
2071 | ||
2072 | memset(iter, 0, sizeof(*iter)); | |
2073 | iter->tr = &global_trace; | |
2074 | iter->pos = -1; | |
2075 | ||
2076 | /* | |
2077 | * We need to stop all tracing on all CPUS to read the | |
2078 | * the next buffer. This is a bit expensive, but is | |
2079 | * not done often. We fill all what we can read, | |
2080 | * and then release the locks again. | |
2081 | */ | |
2082 | ||
2083 | cpus_clear(mask); | |
2084 | local_irq_save(flags); | |
25770467 | 2085 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2086 | ftrace_save = ftrace_enabled; |
2087 | ftrace_enabled = 0; | |
25770467 | 2088 | #endif |
2e0f5761 | 2089 | smp_wmb(); |
b3806b43 SR |
2090 | for_each_possible_cpu(cpu) { |
2091 | data = iter->tr->data[cpu]; | |
2092 | ||
2093 | if (!head_page(data) || !data->trace_idx) | |
2094 | continue; | |
2095 | ||
2096 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2097 | cpu_set(cpu, mask); |
2098 | } | |
2099 | ||
2e0f5761 IM |
2100 | for_each_cpu_mask(cpu, mask) { |
2101 | data = iter->tr->data[cpu]; | |
2102 | spin_lock(&data->lock); | |
2103 | } | |
2104 | ||
088b1e42 SR |
2105 | while (find_next_entry_inc(iter) != NULL) { |
2106 | int len = iter->seq.len; | |
2107 | ||
f9896bf3 | 2108 | ret = print_trace_line(iter); |
088b1e42 SR |
2109 | if (!ret) { |
2110 | /* don't print partial lines */ | |
2111 | iter->seq.len = len; | |
b3806b43 | 2112 | break; |
088b1e42 | 2113 | } |
b3806b43 SR |
2114 | |
2115 | trace_consume(iter); | |
2116 | ||
2117 | if (iter->seq.len >= cnt) | |
2118 | break; | |
b3806b43 SR |
2119 | } |
2120 | ||
d4c5a2f5 | 2121 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2122 | data = iter->tr->data[cpu]; |
b3806b43 | 2123 | spin_unlock(&data->lock); |
2e0f5761 IM |
2124 | } |
2125 | ||
2126 | for_each_cpu_mask(cpu, mask) { | |
2127 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2128 | atomic_dec(&data->disabled); |
2129 | } | |
25770467 | 2130 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2131 | ftrace_enabled = ftrace_save; |
25770467 | 2132 | #endif |
b3806b43 SR |
2133 | local_irq_restore(flags); |
2134 | ||
2135 | /* Now copy what we have to the user */ | |
2136 | read = iter->seq.len; | |
2137 | if (read > cnt) | |
2138 | read = cnt; | |
2139 | ||
2140 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2141 | ||
2142 | if (read < iter->seq.len) | |
2143 | start = read; | |
2144 | else | |
2145 | trace_seq_reset(&iter->seq); | |
2146 | ||
2147 | if (ret) | |
2148 | read = -EFAULT; | |
2149 | ||
2150 | return read; | |
2151 | } | |
2152 | ||
bc0c38d1 | 2153 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2154 | .open = tracing_open_generic, |
2155 | .read = tracing_max_lat_read, | |
2156 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2157 | }; |
2158 | ||
2159 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2160 | .open = tracing_open_generic, |
2161 | .read = tracing_ctrl_read, | |
2162 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2163 | }; |
2164 | ||
2165 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2166 | .open = tracing_open_generic, |
2167 | .read = tracing_set_trace_read, | |
2168 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2169 | }; |
2170 | ||
b3806b43 | 2171 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2172 | .open = tracing_open_pipe, |
2a2cc8f7 | 2173 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2174 | .read = tracing_read_pipe, |
2175 | .release = tracing_release_pipe, | |
b3806b43 SR |
2176 | }; |
2177 | ||
bc0c38d1 SR |
2178 | #ifdef CONFIG_DYNAMIC_FTRACE |
2179 | ||
2180 | static ssize_t | |
2181 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2182 | size_t cnt, loff_t *ppos) | |
2183 | { | |
2184 | unsigned long *p = filp->private_data; | |
2185 | char buf[64]; | |
2186 | int r; | |
2187 | ||
2188 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2189 | |
2190 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2191 | } |
2192 | ||
2193 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2194 | .open = tracing_open_generic, |
2195 | .read = tracing_read_long, | |
bc0c38d1 SR |
2196 | }; |
2197 | #endif | |
2198 | ||
2199 | static struct dentry *d_tracer; | |
2200 | ||
2201 | struct dentry *tracing_init_dentry(void) | |
2202 | { | |
2203 | static int once; | |
2204 | ||
2205 | if (d_tracer) | |
2206 | return d_tracer; | |
2207 | ||
2208 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2209 | ||
2210 | if (!d_tracer && !once) { | |
2211 | once = 1; | |
2212 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2213 | return NULL; | |
2214 | } | |
2215 | ||
2216 | return d_tracer; | |
2217 | } | |
2218 | ||
60a11774 SR |
2219 | #ifdef CONFIG_FTRACE_SELFTEST |
2220 | /* Let selftest have access to static functions in this file */ | |
2221 | #include "trace_selftest.c" | |
2222 | #endif | |
2223 | ||
bc0c38d1 SR |
2224 | static __init void tracer_init_debugfs(void) |
2225 | { | |
2226 | struct dentry *d_tracer; | |
2227 | struct dentry *entry; | |
2228 | ||
2229 | d_tracer = tracing_init_dentry(); | |
2230 | ||
2231 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2232 | &global_trace, &tracing_ctrl_fops); | |
2233 | if (!entry) | |
2234 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2235 | ||
2236 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2237 | NULL, &tracing_iter_fops); | |
2238 | if (!entry) | |
2239 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2240 | ||
2241 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, | |
2242 | &global_trace, &tracing_lt_fops); | |
2243 | if (!entry) | |
2244 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2245 | ||
2246 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2247 | &global_trace, &tracing_fops); | |
2248 | if (!entry) | |
2249 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2250 | ||
2251 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2252 | &global_trace, &show_traces_fops); | |
2253 | if (!entry) | |
2254 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2255 | ||
2256 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2257 | &global_trace, &set_tracer_fops); | |
2258 | if (!entry) | |
2259 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2260 | ||
2261 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2262 | &tracing_max_latency, | |
2263 | &tracing_max_lat_fops); | |
2264 | if (!entry) | |
2265 | pr_warning("Could not create debugfs " | |
2266 | "'tracing_max_latency' entry\n"); | |
2267 | ||
2268 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2269 | &tracing_thresh, &tracing_max_lat_fops); | |
2270 | if (!entry) | |
2271 | pr_warning("Could not create debugfs " | |
2272 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2273 | entry = debugfs_create_file("README", 0644, d_tracer, |
2274 | NULL, &tracing_readme_fops); | |
2275 | if (!entry) | |
2276 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2277 | ||
b3806b43 SR |
2278 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2279 | NULL, &tracing_pipe_fops); | |
2280 | if (!entry) | |
2281 | pr_warning("Could not create debugfs " | |
2282 | "'tracing_threash' entry\n"); | |
bc0c38d1 SR |
2283 | |
2284 | #ifdef CONFIG_DYNAMIC_FTRACE | |
2285 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2286 | &ftrace_update_tot_cnt, | |
2287 | &tracing_read_long_fops); | |
2288 | if (!entry) | |
2289 | pr_warning("Could not create debugfs " | |
2290 | "'dyn_ftrace_total_info' entry\n"); | |
2291 | #endif | |
2292 | } | |
2293 | ||
2294 | /* dummy trace to disable tracing */ | |
2295 | static struct tracer no_tracer __read_mostly = | |
2296 | { | |
4bf39a94 | 2297 | .name = "none", |
bc0c38d1 SR |
2298 | }; |
2299 | ||
4c11d7ae | 2300 | static int trace_alloc_page(void) |
bc0c38d1 | 2301 | { |
4c11d7ae | 2302 | struct trace_array_cpu *data; |
4c11d7ae SR |
2303 | struct page *page, *tmp; |
2304 | LIST_HEAD(pages); | |
c7aafc54 | 2305 | void *array; |
4c11d7ae SR |
2306 | int i; |
2307 | ||
2308 | /* first allocate a page for each CPU */ | |
2309 | for_each_possible_cpu(i) { | |
2310 | array = (void *)__get_free_page(GFP_KERNEL); | |
2311 | if (array == NULL) { | |
2312 | printk(KERN_ERR "tracer: failed to allocate page" | |
2313 | "for trace buffer!\n"); | |
2314 | goto free_pages; | |
2315 | } | |
2316 | ||
2317 | page = virt_to_page(array); | |
2318 | list_add(&page->lru, &pages); | |
2319 | ||
2320 | /* Only allocate if we are actually using the max trace */ | |
2321 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2322 | array = (void *)__get_free_page(GFP_KERNEL); | |
2323 | if (array == NULL) { | |
2324 | printk(KERN_ERR "tracer: failed to allocate page" | |
2325 | "for trace buffer!\n"); | |
2326 | goto free_pages; | |
2327 | } | |
2328 | page = virt_to_page(array); | |
2329 | list_add(&page->lru, &pages); | |
2330 | #endif | |
2331 | } | |
2332 | ||
2333 | /* Now that we successfully allocate a page per CPU, add them */ | |
2334 | for_each_possible_cpu(i) { | |
2335 | data = global_trace.data[i]; | |
b3806b43 | 2336 | spin_lock_init(&data->lock); |
d4c5a2f5 | 2337 | lockdep_set_class(&data->lock, &data->lock_key); |
4c11d7ae | 2338 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2339 | list_del_init(&page->lru); |
4c11d7ae SR |
2340 | list_add_tail(&page->lru, &data->trace_pages); |
2341 | ClearPageLRU(page); | |
2342 | ||
2343 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2344 | data = max_tr.data[i]; | |
b3806b43 | 2345 | spin_lock_init(&data->lock); |
d4c5a2f5 | 2346 | lockdep_set_class(&data->lock, &data->lock_key); |
4c11d7ae | 2347 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2348 | list_del_init(&page->lru); |
4c11d7ae SR |
2349 | list_add_tail(&page->lru, &data->trace_pages); |
2350 | SetPageLRU(page); | |
2351 | #endif | |
2352 | } | |
2353 | global_trace.entries += ENTRIES_PER_PAGE; | |
2354 | ||
2355 | return 0; | |
2356 | ||
2357 | free_pages: | |
2358 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2359 | list_del_init(&page->lru); |
4c11d7ae SR |
2360 | __free_page(page); |
2361 | } | |
2362 | return -ENOMEM; | |
bc0c38d1 SR |
2363 | } |
2364 | ||
2365 | __init static int tracer_alloc_buffers(void) | |
2366 | { | |
4c11d7ae SR |
2367 | struct trace_array_cpu *data; |
2368 | void *array; | |
2369 | struct page *page; | |
2370 | int pages = 0; | |
60a11774 | 2371 | int ret = -ENOMEM; |
bc0c38d1 SR |
2372 | int i; |
2373 | ||
26994ead SR |
2374 | global_trace.ctrl = tracer_enabled; |
2375 | ||
4c11d7ae | 2376 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2377 | for_each_possible_cpu(i) { |
4c11d7ae | 2378 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2379 | max_tr.data[i] = &per_cpu(max_data, i); |
2380 | ||
4c11d7ae | 2381 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2382 | if (array == NULL) { |
4c11d7ae SR |
2383 | printk(KERN_ERR "tracer: failed to allocate page" |
2384 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2385 | goto free_buffers; |
2386 | } | |
4c11d7ae SR |
2387 | |
2388 | /* set the array to the list */ | |
2389 | INIT_LIST_HEAD(&data->trace_pages); | |
2390 | page = virt_to_page(array); | |
2391 | list_add(&page->lru, &data->trace_pages); | |
2392 | /* use the LRU flag to differentiate the two buffers */ | |
2393 | ClearPageLRU(page); | |
bc0c38d1 SR |
2394 | |
2395 | /* Only allocate if we are actually using the max trace */ | |
2396 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2397 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2398 | if (array == NULL) { |
4c11d7ae SR |
2399 | printk(KERN_ERR "tracer: failed to allocate page" |
2400 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2401 | goto free_buffers; |
2402 | } | |
4c11d7ae SR |
2403 | |
2404 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2405 | page = virt_to_page(array); | |
2406 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2407 | SetPageLRU(page); | |
bc0c38d1 SR |
2408 | #endif |
2409 | } | |
2410 | ||
2411 | /* | |
2412 | * Since we allocate by orders of pages, we may be able to | |
2413 | * round up a bit. | |
2414 | */ | |
4c11d7ae | 2415 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2416 | pages++; |
2417 | ||
2418 | while (global_trace.entries < trace_nr_entries) { | |
2419 | if (trace_alloc_page()) | |
2420 | break; | |
2421 | pages++; | |
2422 | } | |
89b2f978 | 2423 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2424 | |
4c11d7ae SR |
2425 | pr_info("tracer: %d pages allocated for %ld", |
2426 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2427 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2428 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2429 | ||
2430 | tracer_init_debugfs(); | |
2431 | ||
2432 | trace_init_cmdlines(); | |
2433 | ||
2434 | register_tracer(&no_tracer); | |
2435 | current_trace = &no_tracer; | |
2436 | ||
60a11774 SR |
2437 | /* All seems OK, enable tracing */ |
2438 | tracing_disabled = 0; | |
2439 | ||
bc0c38d1 SR |
2440 | return 0; |
2441 | ||
2442 | free_buffers: | |
2443 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2444 | struct page *page, *tmp; |
bc0c38d1 SR |
2445 | struct trace_array_cpu *data = global_trace.data[i]; |
2446 | ||
c7aafc54 | 2447 | if (data) { |
4c11d7ae SR |
2448 | list_for_each_entry_safe(page, tmp, |
2449 | &data->trace_pages, lru) { | |
c7aafc54 | 2450 | list_del_init(&page->lru); |
4c11d7ae SR |
2451 | __free_page(page); |
2452 | } | |
bc0c38d1 SR |
2453 | } |
2454 | ||
2455 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2456 | data = max_tr.data[i]; | |
c7aafc54 | 2457 | if (data) { |
4c11d7ae SR |
2458 | list_for_each_entry_safe(page, tmp, |
2459 | &data->trace_pages, lru) { | |
c7aafc54 | 2460 | list_del_init(&page->lru); |
4c11d7ae SR |
2461 | __free_page(page); |
2462 | } | |
bc0c38d1 SR |
2463 | } |
2464 | #endif | |
2465 | } | |
60a11774 | 2466 | return ret; |
bc0c38d1 | 2467 | } |
60a11774 | 2468 | fs_initcall(tracer_alloc_buffers); |